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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd878ad6e7fa278c113f2f30a7dc43622c8c9368ecf10cc427882ca9affc375c' 
  AND token = 'ZJeaFcrhhI/ouCbo4jTckvRD0KkDxCdtrX7ns6+adio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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