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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77832d28fa984c5fd9e241f6ca89473f07b4456c28f80fce95bc9b6309f8e167' 
  AND token = 'jJILkjHgXremYUaJea6ggu9iJq1OMC3aX/utk8fBRfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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