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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccf157604f5416165ab57379089bdc3691e4d582cd54cfc61b127d01e39ee11' 
  AND token = 'NrHR/RPN5ctyymmUfiQ7dj7A425dnVOGXQKu/DbNGaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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