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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1267c9b48a539e2e64f4620069b1a025e4ab376889a1aa098c141c7806085075' 
  AND token = '35G/OHjH7slTnAL3M6XLEHu5HMWMwcWRIK1/wAt8dcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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