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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674be637205909e0ee673cafaeba0f217775d7d226f3868930c8c3d1144f7587' 
  AND token = 'Z42tJOMFb4XO/zYn8NU4VZKZ6nXs6x2oD5Xva58Su7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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