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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf03859634324e9c374f87a270a41b8bd4640c4ce540ad3adf5aa31673c04da' 
  AND token = '3tbgKKRfqKe8ROk+taCpP1zeLwrNnR4EZICc0R+gpHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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