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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f20188e7f97cd6ac0476413e150f36c066ac1b42a90ff8fd0774f0b6dd525d' 
  AND token = '6oMts8d8csRkjrsSJ/Y0nLRJlJKo2FXYSzbC9djd9Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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