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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ce0ad33e7a1ee1d2c68a321e8e01c38e8b4677c58d1235836f77b1a1860773' 
  AND token = 'gCd6jzrtPsno0gMKSuez/R4HL2Rg2cYcRWXyIhHimgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}