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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2349aa02eb978a68954f62bf745916c8963c6bc7114a937b41b71cf766d2bfe2' 
  AND token = 'tP30TsHvTgzFuDe85EuvcG2DZ3f25lywIoDZPAL2F+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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