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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d5ecddfe4d4eb430f86855b4ad345ca3aa9c2c1a70e4ca09c9c7aba1fd9973' 
  AND token = 'tp5ZuWIwg6cJWk8vh0lcgS4POqvmgvzE0UGSspLMD8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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