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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a616241966da0c97ee18f2ff9e72695a93772544a15567037c4c9d2b3c4ced' 
  AND token = 'R2h6Z4Ingit7YbOuYN8on2acFWH2WbJ3Y1PMRbuB3hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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