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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6028712c6dba68f9c5b5b87aeaee63da5772582a5d7f67a73e94e8bd2683a031' 
  AND token = 'MlREzSfJE1FreifBoKzhKY8FABuDDnC4fXExo2vN3fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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