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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce6e2ef594a1ff3b332d9779a9a7cfca961e516315a838a0d5233c3154869f7' 
  AND token = 'EeBL2HGlC03EUDc2B+58RkeHqD5jRGx93438fTgMKrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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