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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb261a46469855d30498d4d0ddf0f0679a54b0b5cb5c0f45e1a3583566880ba' 
  AND token = '2P9Z/N5MYfIwj3MkXxea3I94IIfhJbYdAD7+trL44+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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