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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fd07b55f5ee7d5e7dd2a09542810590bef02224a017e70c31f8e9cf49f0d38' 
  AND token = 'Xi/SFkm9yOzBvrOiQzI55HecxXT7BN8RenmJW3gR3J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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