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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5f66dde043ec2837a9c8806211c0e05c03ea0b9b5000df5ecaa827c9814fe9' 
  AND token = 'gpEcNXGRb2yMFQb8DDtKl00Egu7HNEwXgy1SgtrmYCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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