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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69645e5afe31a33deca9737f0283f209ff4c3a2c67743fa24682b73584458c4' 
  AND token = 'wcrvTG239qd4XdEnNoJYSwHplWo+TpMu+syq+cMwGgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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