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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa9b2218ddbd32a77d7ddecc54af46a82d3d9943ac65a7e8ecb1a19655e85a3' 
  AND token = '2KkQbsO8LBzHE4leR7+oZ6kQ84Bcy+v2xSHFzSHVVuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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