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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1318f6cf211de7222602adb5e2e4e5a7f9fea5eec7dbc49511ce90ab6d039e48' 
  AND token = 'GtCL3wbbjzQ8QmS4wDUMJx7e1i8aLpMOEvy9V4O1k78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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