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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4570260fec4770491fa914b3c4d2c800834ae09eb2399c5715a2c2d265f78eb' 
  AND token = 'm4Eno5hWw+FFOssdloNJ860Boz2N9hnmHGs1JgrcWoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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