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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd11fd08336385a4483ee4bddc017332cf3b5a6b6f2579aa7248b1b9686f4763' 
  AND token = '1rUsZ6MVE78m67sjaRrsDsJWJ9joVT1U2bs5BToSvDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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