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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089144b17f9d2896144a1846fe173faa29ee54941a58cef0824befd15fa9c32f' 
  AND token = 'K5Vmo4/rnZVsZsJYaND5QUJZVvJhmOrSRFeyVQmkO40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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