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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebddb9391a8e91337dbefa9bf6f69fb8367f618228366513c9b16f1c3a723fc3' 
  AND token = '/vPoeSpnf5f5YYpGPuCf7MKxA4kQKZ3hulusVFTdHu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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