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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3f0212c13172ff4229e9c13c09df7dfc3ff0e0ff9c9c8fe4aa0521888e3e9f' 
  AND token = '+DjNn5saqIf7X0Oiy06Ca6hJa7O3/DoncZXG+20lNDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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