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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcdc2d9230be48731e8c052a7283dc0de753983e364564983b330ccaf56d6c4' 
  AND token = '3dbAnUVxjPlbgMz1yd3MrWNmodkgod07Qy6xr/Q9NEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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