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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccd7caf1dc7ec7ae6fdc59a44e3d1f8e75299d237968979e6c0aaa79d9f8702' 
  AND token = 'L4Wsya/7G6Il0e2PFQ165EoENykszh7sfuJc8mMfFOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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