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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc689f026775751d6af6980d1fe1915ad611edd7d233df93157e049c712cd95d' 
  AND token = '1Y75wVoKoD7UrRjb61UYYu5NnC8rdSYRyiEz7BUBdgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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