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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a17bbf069aa251cc3d0378b14e59406764d328c9a92eaac74ed9b8d4fcfaea3' 
  AND token = 'lNe+gE/aepS0f/U03oz22e0rgyXnQdJ0kdLWNECDIec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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