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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89258191ccb2368545537e79e8b5a0ebb957bb01d119c846c2d030d9cf23d4d2' 
  AND token = 'RemZI992wHM3ZkZYcnjSG5qFd85We7KuwDE3RGT2BN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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