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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504ed447679238e0f57772bd152054a1052de61c27e554c2aa12c476ac646d26' 
  AND token = '4PhoN9GfhJkGoaP7cxVBZ+PwEG55gYZxtoU/4NSZpbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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