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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '144c29470aa2068b43a66d2544bdbb6aff7f37fd7592a2ed747a1a8766d31006' 
  AND token = 'XZmDHMZF9po2OvH/prt6u06Qyiihk7/2QcHEe3Dqhvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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