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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8671a5956a444b8e5f2dc242987c0dc4aba5f9f17785444d6e8b54742b42558a' 
  AND token = 'vJIBJJ4iF33E9X1fgzlzX67PIKp9OkIHB0Ks4IWqMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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