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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ae7c20902e44f820178cbc4c549164f3b47330aa1109204e28a2e5ff0bbff0' 
  AND token = 'wnVDwVB9yPnjzR1C+VQkBkbA9el7USmoLO5HvG7LP5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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