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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b27ef72b02e3d23eda1c98e727ccfe4fa8ec4b47643c0da4d1c79bd6bd1aabd' 
  AND token = 'xErM/EUZiTxuO0dn8kcXDjOeW9tji9RIUJeL+hKqyJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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