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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0824fc46f647c49e31782a2c7b19916e22bba3d20e4bf31db3f44de84b3fc58a' 
  AND token = 'GIwz/eb6BXgIDDiA3zRQrck/X6eXAhKIaxSz7XvFvl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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