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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad268400268a6ef1a4432b4a5a62e838b50932bf983f656259f3b79e98b663e1' 
  AND token = 'hahnRhWoP8F5iwil3+fujrVXAbCJqTPmKQ0L0cOv8mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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