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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb16c016aaee02d000d29919d38ccb8f09faa1605ad36f4ccceb39997dbc0c61' 
  AND token = 'iKWhGrQEzCtzwK7dXvQ0NBryYkm2GYa2o4sQiiHwou8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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