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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db234bdc247ec8c4922d045433128182e9dcd088ab5e739b2cc1a90be3ca298' 
  AND token = 'S5b3iDDuBBCq/XYNLFh6VDTLCy+QP/boB9chJ1NNdlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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