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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f3d6b4931f97de1ee2dbefd2990095499ce118a664ce72ca7e5e5e2e20d187' 
  AND token = '9W1uBq+PJHpyFIzU7QaieNP3mzp58+EmmkRD8QUsIfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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