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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0930514520f562eb7a9ce6d6af1db01bbdb215b51e0dbfdc9b4725c106845f' 
  AND token = 'vY1C9heCtEMlHpfCW/AzRFv7l/gFJ9H/p/OGjbipkco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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