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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a19e58cba17e2207665634b62289dddf61ee3617baee67f0efafcdc8f3b96d2' 
  AND token = '+db+2nESjefsBwYOCAulI0LmSES1yWkRyI5votdCOoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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