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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daf540cc3c72ab5359c956294af8bbb44c03b20e73a7d1d434d3eabc34b16c1' 
  AND token = 'WBF/6Vdo4R2pKRwTH7qL5HV7FQ/v/kXkexqBVgJZ1Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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