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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd25fd41f8d88901f62b48e15141ab5d51ea7de396da371f123c4454258312b4' 
  AND token = '5ZXdB5TI6LQ0JRuU6dsCHinZ7nLELemQkrcMgbm4n2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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