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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6570896d724654d21cdcc4f0e630565b4f1f64a055975000731235e92185bf' 
  AND token = 'VnFVSfT371dNLD6vzrSrW73AZ4hYx4tgcGP+lAnOLek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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