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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6318e9e5857a2fb2083627de0084d1bbec60e8e069c6ef7638c9844473fb63' 
  AND token = '0Xi1EaRdOQTsVHVtj42H5wcVfofi1ihcmorbZXSdPu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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