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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bc59e1d42531a392b56efa7f7eb59b5910368cb9c8fdadfcce4a31c060b908' 
  AND token = 'gmDELDdQQDC5BAeJBejumXmb++0c2r+t+A5mKicElbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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