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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37d0df39bac52321c33f7f03f1cf9b5f4373a4bb84932405ff422ae32304cee' 
  AND token = 'oGRMs+Tjb5ksL2lXtO4UaTaTlACVUdVsOuxxTNeldcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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