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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aead49ac03dc6dad7564702cc05ec966671e45911015d0769232745541c24445' 
  AND token = 'KywRPui7aSpghZUfB6XxwdXysO/wsJmpp+6W/0MWMAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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