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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7381fa8acbb5bbe6c5ae8706571c633d690b7ba1f79ec8ef94f4396122fff4' 
  AND token = '9BbW0on1Es0A+ZVNXZtn4cQv2QOF9L26QjXLsJDYrCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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