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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782dfe4bf946d9ed70b49753ba63a09536f8640374188f336bc14962bfca1c08' 
  AND token = 'Fit20c9jGHgrOddVP5/UHwPOXO23ix4pFLCfCH15OWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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