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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089280bbf285e2cabb00d2673c510eb99453391fabf578275f5a1ccd7500065e' 
  AND token = '5v7DoA6CiuNRJicmK33G68j10EeN1Js+m3S56+Kl35M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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