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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2241df73f7b83211e99e05dfe19af49bb75dccf832c6fabaf211604737fa2d9' 
  AND token = '3N7U+fX/Ut1INMdLnqk59bLmLpnq3FED5RETh5uoOUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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