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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54568681a9d9094cfbeacf39d5b63e4fd7e8bec298f4dd3b9af6484c32a7b123' 
  AND token = 'TyiyENb9yZe4pBfvS/vuF1uxPj/3LpnxjUht3nCYVtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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