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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010d906bc5fa683656ef1f6eb237f8c54bf1fcb814ca0c3aeea4296c4aef3dda' 
  AND token = 'N3npIPVk2OL16vlAVNvz4t0mhs/MKRGASwjIqwt7fbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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