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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562ff44c9d96b42bb71be50c1ef7af1c21bcf497e91e9104c1571b67d04521c3' 
  AND token = 'dGCLLwcM5iCh1fGV8CPFFzqzGew20inDVDyj4mVb6fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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