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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ad20029e74613a44c203e974c0c2b12e038e3d89e69b12f17803e89a870056' 
  AND token = 'sE5RSZje2xUpDj/rArYZg76fs2g1LetwzBuRHYjMQLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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