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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77a8c578f6753c8c7d5316e7f1819cd74aefd5b5ecc0c5eafd2430526f103a4' 
  AND token = '2fxsGEVa+fKmiQ2gcr9G4y7S0BvUKvO91/vBhgbyooc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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