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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332a540748cbab56ebdde959ad22ae8308d0622a9ad6758ebee664a4b2db953a' 
  AND token = 'r1MqF6m8bAvYrAMS3bRKlEhH2Dk3tstiN+UGhsENNT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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