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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd13d4be04b7b24cb0d93a3d2bb62202f917f8151edc48d8e54eb9265246a51a' 
  AND token = 'BqPFMFcBzs/WauIFkomkn4BXwNxB+dfUh8VMRBe5Wck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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