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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95d0dd5d5a43a841b048bb3e9042c9b3375e2731fba377b80deb6b583472fe4' 
  AND token = '0VIiloiiiBBxIj59txw7eYIDoymXhEsw0mKIqxEvuEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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